60 HP is a whole lotta tractor in diesel...my biggest tractor, a '70's MF235, is 35 hp, 42 at the PTO. I have never felt I needed more HP.
As always, it depends on what you want to use the tractor for. My MF235 came with the farm and was used to deep plow, bush hog, harrow, etc. It has almost 4k hours on it and still runs great. It has a front end loader, which it key.
I like old tractors but there are some screaming deals on new tractors that have so much more ease of use, HST transmissions (no shifting), power steering, attachments and, frankly overall usability.
I really like Kubotas and will probably get one in the next year or so. They have a great rep, can be depreciated (the tractor itself as well as the financing) and have very attractive bundle options.
Kubota Tractor Corporation | Tractors